The IRS will remain open to process about 12 million 2012 tax extensions, which expires Oct. 15th. But all audit activities will cease.

Overseas Peace Corps volunteers will continue to receive support and assistance even as the corps ramps down domestically. It says the safety of those volunteers is paramount.

New mortgages could still be endorsed by the Federal Housing Administration, according to USA Today. The FHA backs a large percentage of U.S. loans, particularly for first-time home buyers. Though analysts predict getting any mortgage will take longer.